2015 Vol. 41, No. 6

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Pre-warning method of gas concentration based on correlation analysis of monitoring data
DONG Dingwen, QU Shijia, WANG Honggang
2015, 41(6): 1-5. doi: 10.13272/j.issn.1671-251x.2015.06.001
<Abstract>(59) <PDF>(6)
Abstract:
A pre-warning method of gas concentration based on correlation analysis of monitoring data was proposed. Firstly, statistical characteristic of mine gas monitoring data is analyzed, intrinsic correlation characteristic of time series consisted by the gas monitoring data is researched by use of grey correlation analysis method. Further, pre-warning index and pre-warning threshold are determined based on real-time monitoring data. Then abnormal situation of gas concentration is analyzed and pre-warning level is divided, so as to realize dynamic and quantitative pre-warning. The case analysis shows that the method is applicability for gas concentration pre-warning of single monitoring site, which can provide effective decision basis for daily safety management of coal mine.
Design of data processing program of gas emission amount in working face and its applicatio
WANG Wei, GAO Weiguo
2015, 41(6): 5-9. doi: 10.13272/j.issn.1671-251x.2015.06.002
<Abstract>(37) <PDF>(7)
Abstract:
For problems of complex and difficulty data processing of gas emission amount in gas geological statistics method, data source of gas emission amount was analyzed, and gas emission amount database was established. Gas emission amount data was screened by percentile method, so as to find out the data which could reflect real gas emission amount rule of mine. A gas emission amount screening module was established by use of C programming language and the second development tool of CAD and applied in No.12 Coal Mine of China Pingmei Shenma Group. The application result shows that the gas emission amount screening module improves data processing speed and preparation efficiency of gas geological map and saves a lot of manpower and material resources.
Calculation parameters inversion of mining subsidence based on ant colony algorithm
JIA Xinguo
2015, 41(6): 10-13. doi: 10.13272/j.issn.1671-251x.2015.06.003
<Abstract>(88) <PDF>(4)
Abstract:
For problems of premature convergence and easily fall into local optimal solution existed in inversion method of calculation parameters of mining subsidence, ant colony algorithm was applied to calculation parameters inversion of mining subsidence. Firstly, search space of inversion parameter is discretized, thus parameter inversion problem is transformed into combination optimization problem, and then flow of calculation parameters inversion of probability integral method based on max-min ant colony algorithm is established. Application results show that the ant colony algorithm has strong anti-interference ability for missing data of measuring points, which has better fitting effect than least square method and pattern search method.
Design of sensing system of multi-target motion state based on DM642
HUA Gang, REN Rong, XU Yonggang, FANG Shibing
2015, 41(6): 14-17. doi: 10.13272/j.issn.1671-251x.2015.06.004
<Abstract>(98) <PDF>(5)
Abstract:
In view of defects of false alarm and fail alarm existed in coal mine video monitoring of moving target by artificial methods, a design scheme of sensing system of multi-target motion state based on DM642 was proposed. The system uses DM642 as the control core and monitoring video as input, and adopts multi-threshold segmentation method, inter-frame difference method and edge detection method to realize sensing of multi-target motion state, and the sensing results are sent to the configuration software to display and alarm via Modbus/TCP protocol. The test results show that the system can use video to realize sensing of multi-target motion state well, and can replace large numbers of special sensors of motion state in traditional video monitoring.
Information collection of logistics management and personnel positioning system of mine
XIAO Linjing, WEN Yicheng, SUN Chuanyu, WU Hui
2015, 41(6): 18-21. doi: 10.13272/j.issn.1671-251x.2015.06.005
<Abstract>(85) <PDF>(6)
Abstract:
For resource waste problem caused by independent operation of mine logistics management system and personnel positioning system, a logistics management and personnel positioning system of mine was proposed by integrating the two systems. Functional requirements of the system were analyzed. Design scheme of intelligent terminal and realization scheme of information collection of the system were introduced in details. In the system, transport information of materiel and devices and personnel positioning information were collected by the intelligent terminal using RFID technology, and uploaded to SQL Server database of server through wireless WiFi network. The application shows that the intelligent terminal can upload transport information of materiel and devices and personnel positioning information in real-time with high reliability, which meets functional requirements of the integrated system.
Design of a new type of crawler travelling mechanism of coal mine rescue robot
SUN Guodong, LI Yutan, ZHU Hua
2015, 41(6): 21-25. doi: 10.13272/j.issn.1671-251x.2015.06.006
<Abstract>(62) <PDF>(7)
Abstract:
The advantages and disadvantages of existing crawler travelling mechanisms of coal mine rescue robot were analyzed from structure complexity, obstacle surmounting performance, operability and ground bearing distribution. In view of advantages and disadvantages of existing crawler travelling mechanisms, a new structure of crawler mechanism was designed, and the optimization calculation formulas of the main structure dimensions was given combined with relevant requirements of rescue robots. CUMT-5 type robot was designed according to the proposed calculation formulas. The practical application results of CUMT-5 type robot show that the new type of crawler travelling mechanism has simple structure, good performance in obstacle surmounting and good maneuverability.
Overview of standard and technology development of underground explosion-proof electrical equipment
GAO Peng, HOU Yuanliang, LIU Junjie, LIN Weitong
2015, 41(6): 26-29. doi: 10.13272/j.issn.1671-251x.2015.06.007
<Abstract>(228) <PDF>(12)
Abstract:
The paper summarized coal mine underground explosion-proof electrical technique and its development, emphatically introduced the actualities and development trend of coal mine underground explosion-proof electrical standards, analyzed and studied the difference between two domestic and international electrical standards IEC 60079 and GB 3836. At last, the paper pointed out that the intrinsically safe explosion-proof type will be the next major form of coal mine underground explosion-proof electrical equipment.
Safety evaluation model of coal mine based on principal component and cluster analysis
WANG Jinfeng, QIN Ying, ZHAI Xueqi, FENG Lijie
2015, 41(6): 29-34. doi: 10.13272/j.issn.1671-251x.2015.06.008
<Abstract>(65) <PDF>(4)
Abstract:
Firstly, an evaluation index system of coal mine safety was established from five aspects including people's behavior, safety management, equipment facilities, natural conditions and safety technology and supervision mechanism. Secondly, a safety evaluation model of coal mine was established based on principal component analysis and cluster analysis. Principal component analysis is used to choose comprehensive indexes, so as to reduce the number of evaluation indexes. Cluster analysis is used to classify and evaluate safety status of each coal mine enterprise, so as to analyze similarities and differences. Finally, safety status of 40 coal mine enterprises in a province was evaluated, and application steps of the model were introduced. The application result shows that evaluation result concluded by the model can reflect safety status of coal mine simply and intuitively.
Product structure optimization for classified gravity separation in steam coal preparation plant
LI Ke, ZHU Yunfeng, WANG Zhangguo, LI Yunfei, SANG Kai, SUN Lei
2015, 41(6): 35-39. doi: 10.13272/j.issn.1671-251x.2015.06.009
<Abstract>(82) <PDF>(4)
Abstract:
Each separation system of multi-process steam coal preparation plant was analyzed and an optimization model of product structure was established. By translating distribution curve, product structure formulas under different separation density were obtained. Productivity and ash of primary product were predicted under the condition of different coal washing rate of raw coal, then economic benefits of raw coal per ton was calculated. Separating density and washing rate were obtained at the maximum economic benefits by using differential evolution algorithm, so as to get the optimum product structure. The application show that result calculated by the product structure optimization model for classified gravity separation in steam coal preparation plant based on differential evolution algorithm can meet with the actual one.
Dynamic characteristics analysis of automatic cutting and profiling control system for roadheader
TIAN Jie, WANG Hongyao, WU Miao
2015, 41(6): 40-44. doi: 10.13272/j.issn.1671-251x.2015.06.010
<Abstract>(41) <PDF>(7)
Abstract:
An analysis method was proposed for dynamic characteristics of automatic cutting and profiling control system for roadheader base on transfer function model. Composition and main structure of the system were expounded, and transfer function model of each part of the system was obtained. Dynamic characteristics of the system were simulated when cutting head moved horizontally. The simulation results show that the transfer function of the system is an open-loop transfer function which is composed of proportional, integral and two order oscillation, and the system is a type I system; when adjustable gain is 14, the system outputs a good response with no overshoot and smooth curves, the shorter rising time is 0.428 s, and adjusting time is 0.797 s; the system has no zero point, and characteristic roots are in the left half of S plane with a positive amplitude margin and a phase margin, which shows the system has good stability. The field test shows that vertical cutting error of the cutting head is less than 40 mm, unilateral positioning precision of cutting tunnel section is less than 50 mm as well as repeatability precision is less than 20 mm.
Research of regenerative braking of permanent magnet motor used in explosion-proof electric driving trackless rubber-tyred vehicle
WU Ruibing
2015, 41(6): 44-48. doi: 10.13272/j.issn.1671-251x.2015.06.011
<Abstract>(39) <PDF>(7)
Abstract:
Taking explosion-proof electric driving trackless rubber-tyred vehicle as study object, regenerative braking method and braking microstate of permanent magnet brushless DC traction motor driven by three-phase bridge inverter was analyzed, and the regenerative braking control strategy was put forward. The control strategy adopts PWM chopper regulator method, and can distribute time of wheeling and charging of each PWM cycle through closed loop PI, so as to achieve regenerative braking. The simulation results show that the control strategy is safe and reliable, can effectively realize energy recovery, and improve the energy efficiency of vehicles. When the rotating speed of vehicle driving motor is reduced to about 300 r/min, the vehicle kinetic energy has been significantly reduced, and the energy recovery is noneffective. The conclusion has great significance to opening design of regenerative braking pedal of the explosion-proof electric driving trackless rubber-tyred vehicle.
Experimental study of compressed oxygen supply system based on PID automatic control
ZHOU Song, JIANG Shuguang, WANG Kai
2015, 41(6): 49-52. doi: 10.13272/j.issn.1671-251x.2015.06.012
<Abstract>(46) <PDF>(2)
Abstract:
In view of state that compressed oxygen supply system uses conventional automatic control technology to supply oxygen, and has low utilization rate of compressed oxygen, a compressed oxygen supply system based on PID automatic control was designed and experimental study in sealed experimental chamber was done. The experimental results indicate that the system can automatically control release of compressed oxygen through PID automatic control, realizes accurate oxygen supply, and improves the utilization rate of compressed oxygen compared with conventional automatic control oxygen supply system.
Research of DC stray current in underground coal mine based on distributed parameters
ZHAO Meng, LIN Lingyan, GENG Pulong, LI Yongxue
2015, 41(6): 53-57. doi: 10.13272/j.issn.1671-251x.2015.06.013
<Abstract>(41) <PDF>(2)
Abstract:
DC stray current is one of the major cause of gas explosion in underground coal mine, and has serious threat to the safety production of coal mine. In order to solve this problem, a distributed parameters mathematical model of DC stray current was established on the basis of generation mechanism of stray current. The effects of related parameters on the extent of stray current were analyzed based on the distributed parameters mathematical model, and conclusions were obtained: with the increase of current of locomotive, power supply range and track resistance, the stray current increases linearly, stray current can be reduced by reducing locomotive current, shortening the power interval length and reducing track resistance; When transition resistance between the rail and the earth is below a certain value , the stray current will increase sharply, an effective measure to limit stray current is to ensure insulation between the tail and earth.
Study of mining method of signal of coal and gas outburst
LI Shengpu, WANG Xiaohui
2015, 41(6): 58-60. doi: 10.13272/j.issn.1671-251x.2015.06.014
<Abstract>(32) <PDF>(2)
Abstract:
For problem of inaccurate detection of characteristic signal in coal mining operation because it is difficult to capture nonlinear stochastic variation of abnormal signal with traditional associated clustering algorithm, a mining method of signal of coal and gas outburst based on feature-based association mining algorithm was proposed. The method uses wavelet transform to extract status signal characteristics of coal mine work area to provide a basis for signal mining of coal and gas outburst, and calculates degree of association between the status signal characteristics of coal mine work area to achieve mining of signal of coal and gas outburst. The experimental results show that the method can improve accuracy of mining of signal of coal and gas outburst.
A self-adaptive calibration method for mine-used belt detection with binocular visio
LIU Gaiye, WU Xiyan
2015, 41(6): 61-65. doi: 10.13272/j.issn.1671-251x.2015.06.015
<Abstract>(50) <PDF>(7)
Abstract:
For traditional complex camera calibration methods with low precision used for mine-used belt longitudinal tear detection, an efficient self-adaptive calibration method was proposed for binocular vision detection. A mathematical model of camera and fundamental principle of binocular vision were analyzed, and non-linear distortion parameters were introduced into the linear model. The coordinate values of feature corner points extracted from fused image combining belt image with a 7×7 matrix model are substituted into the matrix constraint equation. Furthermore, internal and external parameters, structure parameters and distortion parameters decomposed of the equation are non-linearly optimized to be more accurate. Finally, overall calculated parameters are compared with the ones obtained by Faugeras self-calibration method using Bayesian estimation error. The experimental results show that the method has high accuracy and reliability.
Improved non-local means filtering algorithm for video monitoring image of coal mine
LI Xinnia
2015, 41(6): 66-70. doi: 10.13272/j.issn.1671-251x.2015.06.016
<Abstract>(33) <PDF>(2)
Abstract:
For unclear underground video monitoring image caused by poor light and a lot of dust, an improved non-local means filtering algorithm was proposed. Firstly, video monitoring images are processed by Log edge extraction operator, so as to extract edge information of the images, and edge images and non-edge images are obtained. Then, non-local means filtering algorithm is improved from the perspective of extraction method of similar image blocks and weighting calculation method, and the improved algorithm is adopted to filter noise in the non-edge images. Finally, the edge images and the filtered non-edge images are fused. Median filtering algorithm, average filtering algorithm, non-local means filtering algorithm and the improved algorithm were used to deal with field images. The test results indicate that the improved algorithm has better image processing effect than the other algorithms.
Effects of sample test conditions on analysis results of coal qualities based on near infra-red method
XU Zhibin, MA Jinghuan, LI Cui, CHEN Fan
2015, 41(6): 70-73. doi: 10.13272/j.issn.1671-251x.2015.06.017
<Abstract>(32) <PDF>(8)
Abstract:
To solve the problem of signal-noise ratio change caused by spectroscopy absorbance, scattering and noise interference resulting from sample accumulation, which caused analysis error, effects of sample state and test condition on near infra-red analysis results were studied. near infra-red spectrograms were collected under different thickness, loading times and different loading tightness, and the data were compressed using principal component analysis. BP neural network models were established based on genetic algorithm, and the prediction performance of different sample state models were compared by determination coefficient, and the sample test conditions were optimized. The experimental results show that repeated loading times and sample tightness will not significantly improve predictive capability of the model. While the sample loading thickness is 0.5 mm, the determination coefficient of testing set R2 of moisture, ash, volatile matter and heat prediction model respectively are 0.936 6, 0.791 6, 0.894 9 and 0.857 5, which show good performace of the model.
Research of influence law of water content in coal to gas adsorption and desorption characteristics
LI Yaoqian, LIU Guolei
2015, 41(6): 74-77. doi: 10.13272/j.issn.1671-251x.2015.06.018
<Abstract>(103) <PDF>(5)
Abstract:
In order to verify the influence law of water content in coal to gas adsorption and desorption characteristics, gas adsorption and desorption experiments were carried out in different equilibrium pressure conditions with different water content in coal. The experiment results show that the gas adsorption capacity decreases with increasing of water content in coal, it could be corrected by use of water content influence coefficient in practical application. With the water content increasing, the gas desorption became slower and the amount of gas remaining was greater. The water filled in the coal gap has inhibitory effect to gas adsorption and desorption.
Application of non line-of-sight error suppression method in mine target locatio
TIAN Zijian, ZHU Yuanzhong, ZHANG Xiangyang, LIU Yuyang
2015, 41(6): 78-82. doi: 10.13272/j.issn.1671-251x.2015.06.019
<Abstract>(59) <PDF>(4)
Abstract:
It was analyzed and pointed out that distance ranging error caused by non line-of-sight transmission delay of electromagnetic wave was the main reason of reducing mine location precision. For mine target location method based on time of arrival, a non line-of sight error suppression method based on energy detection was proposed. In the method, threshold of direct path and length of signal intercept time are analyzed and counted by testing channel characteristics of coal mine tunnel. In order to identify non line-of-sight signal, arrival time of direct path energy blocks is presented in extracted signal segment by constructing corresponding identification parameters. The experimental testing result shows the method achieves higher range and location precision.
Multi-channel allocation algorithm for wireless Mesh network in coal mine emergency rescue
ZHANG Liya, MENG Qingyong, WEN Liang
2015, 41(6): 83-86. doi: 10.13272/j.issn.1671-251x.2015.06.020
<Abstract>(41) <PDF>(4)
Abstract:
For a problem that existing multi-channel allocation algorithms for wireless Mesh network were unable to resolve channel allocation jitter caused by transmission interference in coal mine emergency rescue, a multi-channel allocation algorithm was proposed which was based on hierarchical topology and interference avoiding combining connectivity and interference model of wireless Mesh network. In the algorithm, network topology is layered firstly. The first layers of nodes and edges are determined, and topological distribution of other layers is continued. Then channel allocation is done according to interference condition of each layer. A simulation model was designed. In the simulation model, transmitting distance of wireless Mesh mode is 200 m, interference distance is 500 m, and topology range is 1 000 m×1 000 m. 20 nodes were randomly selected for simulation analysis under the conditions of available channel change and gateway change. The simulation results show that the algorithm improves network throughput and reduces transmission interference in channel allocation which is compared with usual topology structure algorithm.
Design of joint network-channel coding based on Turbo code and its performance analysis
LI Shiyin, LIU Yunling, AI Danping
2015, 41(6): 87-90. doi: 10.13272/j.issn.1671-251x.2015.06.021
<Abstract>(44) <PDF>(2)
Abstract:
According to idea of joint network-channel coding, a scheme of joint network-channel coding based on Turbo code applied to multiple access relay channel was proposed, and implementation of relay node encoding and base station decoding was introduced in details. The simulation of the scheme was compared with the point to point scheme and XOR operation network-channel coding scheme. The simulation results show that the scheme can sufficiently use additional redundancy from the relay channel, and significantly improve performance of wireless communication systems.
Design of remote monitoring and automatic maintenance system of backup battery
LIN Yi
2015, 41(6): 91-93. doi: 10.13272/j.issn.1671-251x.2015.06.022
<Abstract>(32) <PDF>(3)
Abstract:
In view of problem that maintainer cannot get real-time work status of mine-used backup battery, remote monitoring and automatic maintenance system of backup battery was designed. The operation information of backup battery of underground power box is uploaded to central station to achieve real-time monitoring, and discharge maintenance instruction is sent by central station to power box to realize automatic maintenance function. Application of the system can reduce maintenance cost and improve management level of backup battery.
A new evaluation method for power quality of coal mine
SHI Liping, DU Gang
2015, 41(6): 94-97. doi: 10.13272/j.issn.1671-251x.2015.06.023
<Abstract>(36) <PDF>(2)
Abstract:
A new evaluation method for power quality of coal mine was proposed. Comprehensive weight of each power quality index is calculated through linear weighting of objective weight determined by rough set theory and subjective weight obtained by analytic hierarchy process. Matching coefficient between weighted index sequence and reference index sequence of power quality is calculated by use of dynamic time warping method, and evaluation level interval is got, so as to realize comprehensive evaluation for power quality of coal mine. The practical application result verifies feasibility and effectiveness of the method.
Design of mine-used voice communication host based on Modbus RTU protocol
CHENG Zhanju
2015, 41(6): 97-100. doi: 10.13272/j.issn.1671-251x.2015.06.024
<Abstract>(26) <PDF>(3)
Abstract:
In view of problems of distorted voice, missing broadcasting, single function and incompatible with other system existed in current voice communication system used in underground coal face, hardware and software design schemes of a mine-used voice communication host based on Modbus RTU protocol were proposed. The host can not only control internal stored voice broadcasting through switching value which is compatible with active and passive input, but also control voice broadcasting of voice synthesis chip and power amplifier circuit by Modbus RTU protocol. External audio signal can be accessed to the host and broadcasted timely through the power amplifier circuit when it is detected by audio detection circuit. The host meets requirements of underground voice communication between different systems.
Design of automation control system of fully-mechanized coal face
SU Zhengfei, ZHANG Xianyu, DING Congshi, LYU Lei, PENG Qingguo, ZHANG Xiansheng, ZHENG Jiasong
2015, 41(6): 101-103. doi: 10.13272/j.issn.1671-251x.2015.06.025
<Abstract>(41) <PDF>(5)
Abstract:
In order to realize collaborative automation running of equipments on fully-mechanized coal face, an automation control system of fully-mechanized coal face was designed, composition and function realization of three machine control system, belt conveyor control system, coal shearer control system, electro-hydraulic control system of hydraulic support and pump station control system were introduced. Application of the automation control system of fully-mechanized coal face realizes comprehensive information integration of the subsystems, and centralized equipment control of fully-mechanized coal face through centralized control system.
Wireless control system of quantitative loading station based on nRF24L01 and STM32
LIU Ting
2015, 41(6): 104-106. doi: 10.13272/j.issn.1671-251x.2015.06.026
<Abstract>(31) <PDF>(5)
Abstract:
In view of problem that operators of conventional automatic rapid and quantitative loading station have visual blind spot during loading process, a wireless control system of quantitative loading station based on nRF24L01 and STM32 was designed. The system uses wireless handheld terminal to send control commands to loading station receiver, and achieves control of loading conditions of the loading station. The test results show that the system can achieve effective data transmission within the range of 20 m, so as to realize real-time control of loading conditions of the loading station.

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